Grass Valley 8949MDA-CFR v.1.0.X - Manual (Page 32)

32 8949MDA-CFR and 8949MDA-SFR Instruction Manual
Functional Description
Output Processing
The SDI driver modules feed the outputs ensuring the rise and fall time adjustment
between format selection (SD or HD mode) on the DA outputs.
After the downscaling, in a SDI module, the HD to SD downscaler module directly
feeds the SDI driver module which supplies the signals to the outputs.
After the downscaling, in a composite module, the downscaler module feeds the
composite encoder which converts the signal in a PAL or NTSC signal before
giving it to the output amplifier module to the outputs.
Microprocessor
The main functions of the microprocessor include:
• Providing remote control and monitoring capability for the module (through
ethernet),
• Communicating with equalizer IC to monitor signal present status, reclocker
IC and downscaler module to support status and signal information,
• Relaying module status through on-board LEDs, and
• Configuring module components at power up.
Power Supply
Power is fed from +12 V rails of the frame’s switching power supply. Each stage
of the module receives its own, separate, highly regulated and filtered power
source. The power input is protected by hot swap function which is an electronic
circuit breaker that detects an overcurrent condition.